The composition of United States half dollars changed significantly in 1965. Prior to that year, these coins were composed of 90% silver and 10% copper. However, escalating silver prices led to a reduction in the precious metal used in circulating coinage. While the 1964 half dollar retained the 90% silver composition, subsequent years saw this composition altered.
The mid-1960s marked a turning point in United States coinage. Due to the increasing value of silver, maintaining the prior composition became economically unsustainable. Replacing the precious metal content with a less expensive alternative allowed the government to continue producing coinage for circulation without incurring prohibitive costs. This shift reflects a broader historical trend of adapting the metallic content of coins in response to fluctuating commodity prices and economic pressures. The alteration ensured continued coin production for commerce.